diff options
Diffstat (limited to 'src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated')
4 files changed, 26 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/Cargo.lock b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/Cargo.lock new file mode 100644 index 000000000..9e4e62ddf --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/Cargo.lock @@ -0,0 +1,4 @@ +[[package]] +name = "ownership" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/Cargo.toml b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/Cargo.toml new file mode 100644 index 000000000..e8847526d --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "ownership" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/rustfmt-ignore b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/rustfmt-ignore new file mode 100644 index 000000000..9a53c718a --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/rustfmt-ignore @@ -0,0 +1,3 @@ +We have some weird comments pointing out borrowing scopes that we don't want to change; +unfortunately I haven't found a way to skip them with rustfmt that works so for now we're going to +manually skip those listings. See: https://github.com/rust-lang/rustfmt/issues/4028 diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/src/main.rs b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/src/main.rs new file mode 100644 index 000000000..9fbb372a0 --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-15-dangling-reference-annotated/src/main.rs @@ -0,0 +1,13 @@ +fn main() { + let reference_to_nothing = dangle(); +} + +// ANCHOR: here +fn dangle() -> &String { // dangle returns a reference to a String + + let s = String::from("hello"); // s is a new String + + &s // we return a reference to the String, s +} // Here, s goes out of scope, and is dropped. Its memory goes away. + // Danger! +// ANCHOR_END: here |